Ionia Weather Forecast

    • 40
    • 56

    Decreasing Clouds

    • 48
    • 67

    Chance Rain Showers

    • 47
    • 58

    Rain Showers

    • 55
    • 72

    Chance Rain Showers

    • 54
    • 74

    Mostly Cloudy

    • 55
    • 77

    Partly Sunny

Today 21 May Ontario

Partly to mostly sunny. Cool with Highs Ranging from the lower 50s on the Hilltops to the upper 50s across the lower Elevations. Northeast Winds around 10 Mph, becoming north.

Tonight 21 May Ontario

Mainly clear. Lows in the upper 30s. Light northeast Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Ionia Temperature Statistics

May Temperature

Rochester, Greater Rochester International Airport (15.5 miles)

  • Lowest 12 May, 2026

    33.7 °F

  • Average May

    54.5 °F

  • Highest 18 May, 2026

    89.1 °F

Climate (2021–Present)

Rochester, Greater Rochester International Airport (15.5 miles)

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  • Average Low 2021–2026

    42.3 °F

  • Average 2021–2026

    50.8 °F

  • Average High 2021–2026

    59.5 °F
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